code: def alt(self) -> Optional[Alt]:
      # alt: items '$' action | items '$' | items action | items
      mark = self._mark()
      if (
          (items := self.items())
          and (literal := self.expect("$"))
          and (action := self.action())
      ):
          return Alt(
              items + [NamedItem(None, NameLeaf("ENDMARKER"))],
              action=action,
          )
      self._reset(mark)
      if (items := self.items()) and (literal := self.expect("$")):
          return Alt(
              items + [NamedItem(None, NameLeaf("ENDMARKER"))],
              action=None,
          )
      self._reset(mark)
      if (items := self.items()) and (action := self.action()):
          return Alt(items, action=action)
      self._reset(mark)
      if items := self.items():
          return Alt(items, action=None)
      self._reset(mark)
      return None
  
imports: import ast
  import sys
  import tokenize
  from typing import Any, Optional
  from pegen.parser import memoize, memoize_left_rec, logger, Parser
  from ast import literal_eval
  from pegen.grammar import Alt, Cut, Forced, Gather, Group, Item, Lookahead, LookaheadOrCut, MetaTuple, MetaList, NameLeaf, NamedItem, NamedItemList, NegativeLookahead, Opt, Plain, PositiveLookahead, Repeat0, Repeat1, Rhs, Rule, RuleList, RuleName, Grammar, StringLeaf
label_desc: Use image node_id 11 for calling the GeneratedParser obj's underlying member method code with example usage: obj.alt() and returns: None, Alt, Alt, Alt, Alt